Hanergy Technologies Inc.

HE43002

General Description

HE43002 is an integrated Li-ion charger and system power path management device targeted at space-limited portable applications. The device operates from either a USB port or AC adapter and supports charge current up to 1.5A. The input voltage range with input overvoltage protection supports unregulated adapters. The USB input current limit accuracy and start up sequence allow HE43002 to meet USB-IF inrush current specification. Additionally, the input intelligent power management (VIN-IPM) prevents the charger from crashing incorrectly configured USB sources.

HE43002 features intelligent power path management (IPPM) that powers the system while simultaneously and independently charging the battery. The IPPM circuit reduces the charge current when the input current limit causes the system output to fall to the IPPM threshold; thus, supplying the system load at all times while monitoring the charge current separately. This feature reduces the number of charge and discharge cycles on the battery and allows for proper charge termination and enables the system to run with a defective or absent battery pack.

Additionally, the regulated system input enables instant system turn-on when plugged in even with a fully discharged battery. The power-path management architecture also allows the battery to supplement the system current requirements when the adapter is not able to deliver the peak system currents, enabling the use of a smaller adapter.

Features

Integrated intelligent power path management

(IPPM) function powers the system while charging the battery Supports up to 1.5A charge current with current

monitoring output Programmable input current limit up to 1.5A for wall

adapters Programmable pre-charge and fast-charge Battery low-power voltage selection by pin Battery regulation voltage selection by pin Reverse current, short-circuit and thermal

protection NTC thermistor input

Proprietary start up sequence limits inrush current Typical application for USB (5V) Output Current >

3.1A

No-Load detection to turn off Boost Overvoltage protection for charge input

Overvoltage and overcurrent protection for boost

output Over temperature protection Boost short-circuit protection

Less than 18µA chip power consumption during

idle Individual battery low Indicator: LOWBAT# Up to 4 LED indicators for battery capacity 4 options for push-button and LED display

operations.

The battery is charged in three statuses: pre-charge,

constant current and constant voltage. In all charge Up to 4 external voltage inputs for flexible statuses, an internal control loop monitors the IC adjustment to various battery characteristics junction temperature and reduces the charge current if

Flashlight function

the internal temperature threshold is exceeded. The

input current limit and charge current are 4 mm × 4 mm 28 Lead WQFN Package